<%@ page language="java" contentType="text/html" pageEncoding="utf-8" import="java.util.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="3-1.jsp" method="post">
用户名：<input type="text" name="user" ><br>
密码：<input type="password" name="pass" ><br>
<button type="submit">登录</button>
</form>
</body>
</html>